Morse and Lewis investigate the death of Laura Poindexter, an American tourist who is part of an exclusive tour group visiting Oxford. Missing from her personal effects is her jewelry, including the Wolvercote Tongue which she was going to donate to the Ashmolean Museum. The pathologist determines that she died of natural causes, but Morse feels there's something not quite right. The mystery deepens when Theodore Kemp, the Ashmolean's expert on the Wolvercote Tongue, is found dead and Mrs. Poindexter's husband goes missing.
故事发生在一家名为卢蒙的超级大公司内,一种名为记忆分割术的全新技术正在公司内部进行实验,接受了手术的员工将进行人格分离手术,形成公司人格和日常人格,当踏进公司大门的那一刻,他们的日常人格就会陷入沉睡,身体由公司人格主导。相对的,在离开公司的那一刻,日常人格会重新接管身体,当然,这个人格不会记得任何在公司里发生的事情。马克(亚当·斯科特 Adam Scott 饰)、迪伦(扎克·切利 Zach Cherry 饰)和埃尔文(约翰·特托罗 John Turturro 饰)三人都接受了分离手术,这一天,他们所在的部门迎来了一位名叫海莉(布丽特·洛薇尔 Britt Lower 饰)的新同事,她身上的反叛气质打破了长久萦绕在这个部门,以及整个公司内的平静。